Need help in google map on asp.net

I have a google map on my asp.net page. on which its showing image(marker) on cityname . please tell me 开发者_如何学JAVAhow can i fire event onclick on that marker.

GEvent.addListener(marker, "click", function(point) {
this.openInfoWindowHtml("" + this.value + "");}); return marker; }